Share Repurchases (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended												12 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Share Repurchases [Line Items]
Shares of common stock repurchased													101	126	150
Share Repurchase Program 2016
Share Repurchases [Line Items]
Shares of common stock repurchased							32	29	33	36	57	24		126	150
Value of common stock repurchased							$ 4,600	$ 4,000	$ 4,200	$ 3,899	$ 6,100	$ 2,600		$ 19,688	$ 16,799
Share Repurchase Program 2019
Share Repurchases [Line Items]
Shares of common stock repurchased	24	25	27	25	28								101
Value of common stock repurchased	$ 6,200	$ 5,750	$ 5,750	$ 5,270	$ 5,088								$ 22,970
Share Repurchase Programs 2016 and 2019
Share Repurchases [Line Items]
Shares of common stock repurchased						37
Value of common stock repurchased						$ 6,000